Adobe Acrobat 9.x before 9.2, 8.x before 8.1.7, and possibly 7.x through 7.1.4 allows attackers to cause a denial of service (memory corruption) or possibly execute arbitrary code via unspecified vectors.
Researchers from Fortinet have discovered multiple memory corruption and denial of service vulnerabilities in Adobe Reader/Acrobat versions 9.1.3 and below.